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dc.contributor.authorMoor, B.K.-
dc.contributor.authorKuster, Roman-
dc.contributor.authorOsterhoff, G.-
dc.contributor.authorBaumgartner, Daniel-
dc.contributor.authorWerner, C.M.L.-
dc.contributor.authorZumstein, M.A.-
dc.contributor.authorBouaicha, S.-
dc.description.abstractBackground: The critical shoulder angle combines the acromion index and glenoid inclination and has potential to discriminate between shoulders at risk for rotator cuff tear or osteoarthritis and those that are asymptomatic. However, its biomechanics, and particularly the role of the glenoid inclination, are not yet fully understood. Methods: A shoulder simulator was used to analyze the independent influence of glenoid inclination during abduction from 0 to 60°. Spindle motors transferred tension forces by a cable-pulley on human cadaveric humeri. A six-degree-of-freedom force transducer was mounted directly behind the polyethylene glenoid to measure shear and compressive joint reaction force and calculate the instability ratio (ratio of shear and compressive joint reaction force) with the different force ratios of the deltoid and supraspinatus muscles (2:1 and 1:1). A stepwise change in the inclination by 5° increments allowed simulation of a critical shoulder angle range of 20° to 45°. Findings: Tilting the glenoid to cranial (increasing the critical shoulder angle) increases the shear joint reaction force and therefore the instability ratio. A balanced force ratio (1:1) between the deltoid and the supraspinatus allowed larger critical shoulder angles before cranial subluxation occurred than did the deltoid-dominant ratio (2:1). Interpretation: Glenoid inclination-dependent changes of the critical shoulder angle have a significant impact on superior glenohumeral joint stability. The increased compensatory activity of the rotator cuff to keep the humeral head centered may lead to mechanical overload and could explain the clinically observed association between large angles and degenerative rotator cuff tears.de_CH
dc.relation.ispartofClinical Biomechanicsde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectCompressive strengthde_CH
dc.subjectHumeral headde_CH
dc.subjectJoint instabilityde_CH
dc.subjectAnatomic modelsde_CH
dc.subjectSkeletal musclede_CH
dc.subjectRotator cuffde_CH
dc.subjectShear strengthde_CH
dc.subjectShoulder jointde_CH
dc.subjectShoulder painde_CH
dc.subject.ddc610: Medizin und Gesundheitde_CH
dc.titleInclination-dependent changes of the critical shoulder angle significantly influence superior glenohumeral joint stabilityde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitut für Mechanische Systeme (IMES)de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
Appears in Collections:Publikationen School of Engineering

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